Simple diffusion panel I made from PVC and $3 worth of static free material.

3 - 10' 3/4" PVC
2 - 90 elbow fittings
2- inline couplers
4 - tee fittings
4- end caps

Cut 2 of the 10' pieces into:
2 - 3' sections each (4 total)
1 - 4' section each (2 total)

Cut the remaining 10 section into:
4 - 2' sections
2 - 1' sections

Don't glue anything so you can disassemble when needed and swivel the feet around. It will fit snug and stay together well.